ABAP Select data from SAP table AMASTA into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP AMASTA table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to AMASTA. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the AMASTA table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_AMASTA TYPE STANDARD TABLE OF AMASTA,
      WA_AMASTA TYPE AMASTA,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <AMASTA> TYPE AMASTA.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_AMASTA.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM AMASTA
  INTO TABLE IT_AMASTA.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM AMASTA
*  INTO TABLE @DATA(IT_AMASTA2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_AMASTA INDEX 1 INTO DATA(WA_AMASTA2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_AMASTA ASSIGNING <AMASTA>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<AMASTA>-PROCGUID = 1.
<AMASTA>-DESTIN = 1.
<AMASTA>-INSTANCE = 1.
<AMASTA>-LFNUM = 1.
<AMASTA>-TCODE = 1.

ENDLOOP.

LOOP AT IT_AMASTA INTO WA_AMASTA.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_AMASTA-OKEY, sy-vline,
  WA_AMASTA-CONNECTION_NAME, sy-vline,
  WA_AMASTA-STARTDATE, sy-vline,
  WA_AMASTA-STARTTIME, sy-vline,
  WA_AMASTA-ENDDATE, sy-vline,
  WA_AMASTA-ENDTIME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_AMASTA you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_AMASTA TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_AMASTA INTO WA_AMASTA.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_AMASTA_STR, 
PROCGUID TYPE STRING,
DESTIN TYPE STRING,
INSTANCE TYPE STRING,
LFNUM TYPE STRING,
TCODE TYPE STRING,
OKEY TYPE STRING,
CONNECTION_NAME TYPE STRING,
STARTDATE TYPE STRING,
STARTTIME TYPE STRING,
ENDDATE TYPE STRING,
ENDTIME TYPE STRING,
REPORT TYPE STRING,
TASKTYPE TYPE STRING,
DYNPRONR TYPE STRING,
WPROCTIME TYPE STRING,
KBYTETRANS TYPE STRING,
RESPTIME TYPE STRING,
WAITTIME TYPE STRING,
CPUTIME TYPE STRING,
LDGENTIME TYPE STRING,
MEMORYUSED TYPE STRING,
DBTIME TYPE STRING,
DBCHANGES TYPE STRING,
ROUNDTRIPS TYPE STRING,
INDATA TYPE STRING,
OUTDATA TYPE STRING,
RECPROCNUM_ST TYPE STRING,
TOTALEX_ST TYPE STRING,END OF T_EKKO_STR.
DATA: WA_AMASTA_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_AMASTA_STR-PROCGUID sy-vline 
WA_AMASTA_STR-DESTIN sy-vline 
WA_AMASTA_STR-INSTANCE sy-vline 
WA_AMASTA_STR-LFNUM sy-vline 
WA_AMASTA_STR-TCODE sy-vline 
WA_AMASTA_STR-OKEY sy-vline 
WA_AMASTA_STR-CONNECTION_NAME sy-vline 
WA_AMASTA_STR-STARTDATE sy-vline 
WA_AMASTA_STR-STARTTIME sy-vline 
WA_AMASTA_STR-ENDDATE sy-vline 
WA_AMASTA_STR-ENDTIME sy-vline 
WA_AMASTA_STR-REPORT sy-vline 
WA_AMASTA_STR-TASKTYPE sy-vline 
WA_AMASTA_STR-DYNPRONR sy-vline 
WA_AMASTA_STR-WPROCTIME sy-vline 
WA_AMASTA_STR-KBYTETRANS sy-vline 
WA_AMASTA_STR-RESPTIME sy-vline 
WA_AMASTA_STR-WAITTIME sy-vline 
WA_AMASTA_STR-CPUTIME sy-vline 
WA_AMASTA_STR-LDGENTIME sy-vline 
WA_AMASTA_STR-MEMORYUSED sy-vline 
WA_AMASTA_STR-DBTIME sy-vline 
WA_AMASTA_STR-DBCHANGES sy-vline 
WA_AMASTA_STR-ROUNDTRIPS sy-vline 
WA_AMASTA_STR-INDATA sy-vline 
WA_AMASTA_STR-OUTDATA sy-vline 
WA_AMASTA_STR-RECPROCNUM_ST sy-vline 
WA_AMASTA_STR-TOTALEX_ST sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.